I have a ct scan with contrast and i was not supposed to take metformin for 48 hours but i accidentally took 1 yesterday morning will i be okay?

Drink water: Taking one metformin pill after having a contrast enhanced cat scan is likely a very low risk. Drink lots of water and stay hydrated to eliminate the contrast. It would be a good idea to call your primary care doctor to check in.

Likely - see ans.: You likely will be fine – that said, the theoretical concern is that iodinated contrast could impair renal function and therefore you could not appropriately excrete the meformin /metabolites causing an extremely unusual condition of lactic acidosis. The american college of radiology recommends the following based on your clinical category (you should discuss with your dr.): category i in patient.